ROCHESTER, N.Y. (WIVB) – A woman has pleaded guilty for her role in the Christmas Eve shootings in West Webster that left a police officer and firefighter dead, and seriously injured two other firefighters.

Dawn Nguyen pleaded guilty Thursday to a three count federal indictment. She provided William Spengler, a known felon, with the firearms he used to carry out his attack.

Spengler set fire outside his Lake Road home in Webster and then used the weapons purchased by Nguyen to fire on firefighters and police. Webster Police Lieutenant Michael Chiapperini and West Webster Firefighter Tomasz Kaczowka were killed, and Firefighters Theodore Scardino and Joseph Hostetter were seriously injured.

Spengler’s sister, Cheryl Spengler, was killed before the attacks began.

Nguyen filled out false information in purchasing the guns. She pleaded guilty to knowingly making a false statement in connection with the purchase of firearms; selling and disposing of firearms to Spengler, a known felon; and possession of firearms while being an unlawful user of marijuana.

She is the only person charged in the case and is likely to face a year and a half to two years in prison.

The judge will determine if the sentence will run consecutively or concurrent to her state sentence for filing fall business records.